add zip cmdline tool

build.zig

@@ -69,6 +69,16 @@ pub fn build(b: *std.Build) !void {
         const install = b.addInstallArtifact(unzip, .{});
         b.step("unzip", "Build/install the unzip cmdline tool").dependOn(&install.step);
     }
+    {
+        const zip = b.addExecutable(.{
+            .name = "zip",
+            .root_source_file = b.path("zip.zig"),
+            .target = target,
+            .optimize = optimize,
+        });
+        const install = b.addInstallArtifact(zip, .{});
+        b.step("zip", "Build/install the zip cmdline tool").dependOn(&install.step);
+    }
 }
 
 fn addTest(

lib/zip.zig

@@ -29,7 +29,9 @@ pub const ExtraHeader = enum(u16) {
 
 const GeneralPurposeFlags = packed struct(u16) {
     encrypted: bool,
-    _: u15,
+    _0: u2 = 0,
+    local_header_zero_fields: bool,
+    _1: u12 = 0,
 };
 
 pub const LocalFileHeader = extern struct {
@@ -192,7 +194,7 @@ pub fn decompress(
     return hash.final();
 }
 
-fn isBadFilename(filename: []const u8) bool {
+pub fn isBadFilename(filename: []const u8) bool {
     if (filename.len == 0 or filename[0] == '/')
         return true;
 

unzip.zig

@@ -10,7 +10,7 @@ fn fatal(comptime fmt: []const u8, args: anytype) noreturn {
 }
 
 fn usage() noreturn {
-    std.log.err("Usage: unzip [-d DIR] ZIP_FILE", .{});
+    std.io.getStdErr().writer().print("Usage: unzip [-d DIR] ZIP_FILE\n", .{}) catch |e| @panic(@errorName(e));
     std.process.exit(1);
 }
 
@@ -78,7 +78,7 @@ pub fn main() !void {
     const zip_file = std.fs.cwd().openFile(zip_file_arg, .{}) catch |err|
         fatal("open '{s}' failed: {s}", .{zip_file_arg, @errorName(err)});
     defer zip_file.close();
-    try @import("zip.zig").extract(out_dir, zip_file.seekableStream(), .{
+    try @import("lib/zip.zig").extract(out_dir, zip_file.seekableStream(), .{
         .allow_backslashes = true,
     });
 }